Posted on October 28, 2015 by Anthony Ritz

The Official Guide for GMAT Review, 2016 page 26, question 39 page 152, question 5 page 158, question 44 page 161, question 60 page 163, question 75 page 164, question 81 page 174, question 153 page 182, question 210 page 183, question 215 page 183, question 217 page 277, question 6 page 279, question […]

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Tags: Algebra, Coordinate Geometry, Geometry, GMAT, Math, Question List

Posted on October 20, 2015 by Anthony Ritz

The Official Guide for GMAT Review, 2016 page 25, question 30 page 25, question 37 page 154, question 16 page 154, question 17 page 159, question 51 page 161, question 61 page 165, question 88 page 168, question 107 page 174, question 155 page 175, question 163 page 176, question 168 page 185, question […]

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Tags: Absolute Value, Algebra, GMAT, Inequalities, Math, Question List

Posted on October 20, 2015 by Anthony Ritz

The Official Guide for GMAT Review, 2016 page 22, question 16 page 25, question 35 page 152, question 3 page 155, question 25 page 159, question 47 page 160, question 53 page 160, question 54 page 162, question 66 page 163, question 74 page 164, question 82 page 164, question 84 page 165, question […]

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Tags: Algebra, GMAT, Math, Question List, Systems of Equations

Posted on October 20, 2015 by Anthony Ritz

The Official Guide for GMAT Review, 2016 page 161, question 63 page 175, question 159 page 177, question 173 The Official Guide for GMAT Quantitative Review, 2016 page 77, question 117 page 154, question 15

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Tags: Algebra, Functions, GMAT, Math, Question List

Posted on October 20, 2015 by Anthony Ritz

The Official Guide for GMAT Review, 2016 page 158, question 42 page 162, question 68 page 164, question 83 page 170, question 121 page 172, question 141 page 181, question 206 page 185, question 225 page 279, question 37 page 282, question 65 page 284, question 81 page 287, question 114 page 293, question […]

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Tags: Algebra, GMAT, Math, Quadratric Equations, Question List, Special Quadratics

Posted on July 16, 2012 by Anthony Ritz

For this week’s post I decided to do a GMAT math question. The Official Guide for the GMAT provides explanations for all included questions, so I’m going to write one of my own and discuss it. This question could just as easily show up on a test like the GRE, the SAT, or the ACT.

The number N is increased by x% and then the result is decreased by x%. If the result is 64% of N, which of the following could be the value of x?

A. 8

B. 36

C. 60

D. 64

E. None of these

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Tags: ACT, Algebra, GMAT, GRE, Math, Percents, Question Analysis, SAT

Posted on June 29, 2012 by Anthony Ritz

Today’s post is for all the GMAT (and GRE and SAT and ACT) students out there. Working with a student this week reminded me just how confused many test-takers are about what it really means for something to be a function and how often it is that these test-takers wind up frozen and unable to even begin to tackle function questions.

Ultimately, a lot of people just don’t understand what functions actually are.

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Tags: ACT, Algebra, Functions, GMAT, GRE, Math, SAT